JP2595668B2 - Heat treatment method and apparatus for metal container coated with synthetic resin - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and apparatus for heat-treating a synthetic resin-coated metal container which can be suitably used as an exterior container for housing a capacitor element constituting an aluminum electrolytic capacitor. About.

(Prior art and its problems) A laminate in which a synthetic resin is provided in advance on a metal plate such as an aluminum plate is drawn so that the synthetic resin layer is on the outside, thereby obtaining a synthetic resin-coated metal container such as a container for a capacitor exterior. It is known.

However, a container for a capacitor exterior obtained by drawing using such a laminate has the following problems and has not been put to practical use.

In other words, after performing a drawing process such as a multi-stage drawing in the container for condenser exterior, after inserting the capacitor element,
When caulking (curling) is applied, even if there is no problem with interlayer adhesion in the drawing process, the resin in the caulked part peels or breaks, so as a performance as an outer container for capacitors,
It is easy to cause problems in appearance.

Thus, it has been found that by performing a drawing process and then performing a heat treatment in a temperature range not lower than the melting point of the coated resin, the adhesive strength between the layers can be improved (Japanese Patent Application No. 62-22 / 1987).
No. 4736), when a large amount of the above-mentioned condenser container is subjected to heat treatment at one time, there is a problem that the coated synthetic resins are softened to each other, thereby joining and separating the container.

An object of the present invention is to provide a heat treatment method and an apparatus for heat treating a synthetic resin-coated metal container as described above easily and in large quantities.

(Means for Solving the Problems) In order to achieve the above object, in the heat treatment method and apparatus according to the present invention, a synthetic resin-coated container having an opening downward is transferred by a needle-like body having a diameter sufficiently smaller than the diameter of the opening. It has been found that the above problems can be solved by heat treatment.

Hereinafter, the present invention will be described in detail with reference to the drawings. First
FIG. 1 is a schematic sectional view showing an example of the apparatus of the present invention, and FIG.
FIG. 3 is an enlarged cross-sectional view taken along the line II in FIG. 3, and FIG. 3 is a schematic front view taken along the line III in FIG. The synthetic resin-coated metal container 1 to be subjected to the method of the present invention is obtained by drawing a laminated plate in which a metal plate such as an aluminum plate is coated with a synthetic resin such as a polyolefin resin, a nylon resin or a vinyl chloride resin in advance. However, depending on the application, it is also possible to use a metal container which has been previously drawn and coated with a synthetic resin by a dipping method or the like.

The synthetic resin provided in the container 1 may be provided only on the outer surface or on both the inner and outer surfaces of the container, depending on the use and the like.

In the present invention, it is necessary to hold the opening of the container 1 downward and insert the needle-like body 3 from below. Needle 3
It is necessary to use a material whose diameter is sufficiently smaller than the diameter of the opening of the container 1, and determine the diameter, material, length, etc. in consideration of the strength capable of reliably supporting the container and the ease of attaching and detaching the container. I just need.

By using such a small-diameter needle-shaped body, the container can be easily attached and detached, the heat treatment is small because the heat capacity is small, and the influence on the container in the cooling step can be reduced.
Further, in the case of the container having the inner surface coated, there is an advantage that adhesion to the resin in the heat treatment step can be eliminated.

Next, the container is supported and transferred by the needle-like body,
As the transfer means, an ordinary transfer means such as an endless chain having needle-like bodies provided at regular intervals so that the containers do not contact each other is possible. Continuously transferred containers need to be heat treated and then cooled during the transfer.

Various methods such as a hot air circulation method can be applied as a means for the heat treatment, and a normal cooling air cooling method or the like may be used as the cooling means.

Next, a specific example of the device of the present invention will be described in more detail.

(Embodiment) As shown in Fig. 1, in the apparatus of the present invention, the feeder 2 and the needle-like body 3 for supplying the above-described containers arranged in an opening downward, for example, at regular intervals in the traveling direction. It mainly comprises an endless chain 4 provided, a heat treatment 5 provided to cover an intermediate portion of the endless chain 4, and a cooling device 6.

The feeder 2 can use a normal vibration-type parts feeder. A plurality of containers with opening portions downward are sent out to the feeder tip 21 sequentially, and the containers held at the feeder tip 21 are successively placed in the endless chain 4. It is transported by the upper needle 3. 2 and 3 show enlarged views of the vicinity of the feeder tip, the container 1 is fed into the feeder tip 21 by sliding on the shooter 22 inclined at a constant angle β. A notch 24 is provided below the feeder tip 21 as shown in FIG. 3, so that the tip of the needle 3 can be easily inserted into the inner surface of the container.

Further, a stopper 23 for holding the container and a container holder 24 for preventing the container from jumping up by the needle-like body are provided at the upper portion of the container at the feeder tip 21. The stopper 23 can be formed by bending a side guide plate provided on the shooter 22, and the container retainer 24 is made of a material having some elasticity, for example, a bundle of plastic fibers, and slightly presses the upper surface of the container. It may be used in such a manner.

Further, an endless chain 4 is arranged close to the feeder tip 21. As the endless chain, a normal endless chain connected to a drive motor capable of changing the speed can be used. Are provided at regular intervals in the traveling direction of the container, and the interval is set so that the supported containers do not contact each other.
The angle of the chain 4 may be appropriately changed near the feeder tip 21 so that the tip of the needle-like body can be easily inserted into the inner surface of the container as shown in FIG. In addition, the length of the needle-shaped body can be appropriately determined as long as insertion can be easily performed.

A heat treatment furnace 5 is provided at an intermediate portion of the endless chain 4 having the needle-like body in the traveling direction so as to cover the chain, and a hot air circulation type heat treatment apparatus can be suitably used.
The heating temperature, capacity, and the like of the heat treatment furnace may be appropriately determined in consideration of the type of resin coated on the container, the speed of the endless chain, and the like. Further, a cooling device 6 is provided behind the endless chain in the traveling direction. As the cooling device, a cooling device using ordinary cooling can be used. After cooling, the container is stored in the storage box 7 and used in the next step.

(Effects of the Invention) As described above, the method and apparatus of the present invention have the following effects. The synthetic resin-coated metal container can be reliably heat-treated continuously and in large quantities, and a device having a simple configuration can be obtained without using a special transfer device or the like, and can be suitably used for an aluminum electrolytic capacitor outer container or the like. Things.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an example of the apparatus of the present invention, FIG. 2 is an enlarged cross-sectional view taken along the line II in FIG. 1, and FIG. 3 is a line II in FIG.
It is the front schematic from the I direction. DESCRIPTION OF SYMBOLS 1 ... Metal container coated with synthetic resin 2 ... Feeder 21 ... Feeder tip 3 ... Needle body 4 ... Endless chain 5 ... Heat treatment furnace 6 ... Cooling device

Claims (2)

(57) [Claims] A synthetic-resin-coated metal container having at least an outer surface coated with a synthetic resin and held with an opening downward.
After the needle (3) having a diameter sufficiently smaller than the diameter of the opening is inserted from below, the container (1) is inserted by the needle (3).
A method of heat-treating a synthetic resin-coated metal container, comprising transferring the container while supporting the container, heat-treating the container (1) during the transfer, and then cooling the container. 2. A plurality of synthetic resin-coated metal containers each having at least an outer surface coated with a synthetic resin and having an opening downward.
The endless chain (4) in which a plurality of needles (3) having a diameter sufficiently smaller than the diameter of the opening is provided at regular intervals in the traveling direction is provided at the tip (21) of the feeder (2) which supplies the needles in a line. ) Is arranged such that the tip of the needle-like body (3) is inserted into the inner surface of the container held by the feeder tip (21), and further, an intermediate portion thereof in the traveling direction of the endless chain (4). A heat treatment furnace (5), and a cooling device (6) at the rear thereof.